1.

Ionic mobility of which of the following 2nd group metal ions is maximum in aqueous solution? (1) Mg2+(2) Ca2+(3) Sr2+(4) Be2+ 

Answer»

Correct option is (3) Sr2+

Smaller the size of ion greater is it's hydration & greater is it's hydrated radii & smaller is ionic mobility. So order of ionic mobility: 

Be2+ < Mg2+< Ca2+ < Sr2+ < Ba2+



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